[docs] core-mentorship mailing list link broken

[Ajna Cackovic]

The link to the core-mentorship mailing list listed in the docs:
https://docs.python.org/3/bugs.html <https://docs.python.org/3/bugs.html> 

points to:
https://mail.python.org/mailman/listinfo/core-mentorship/ <https://mail.python.org/mailman/listinfo/core-mentorship/> 

That page is a 301 and redirects to:
https://mail.python.org/mailman3/lists/core-mentorship.python.org// <https://mail.python.org/mailman3/lists/core-mentorship.python.org//>

Which is a 404. The actual page should be:
https://mail.python.org/mailman3/lists/core-mentorship.python.org/ <https://mail.python.org/mailman3/lists/core-mentorship.python.org/>

Without the double slash at the end.

This isn’t really a bug in a docs, but this seemed like the best place to report it. I hope that this helps.
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